Boloria epithore, Pacific Fritillary

The checkered Pacific Fritillary is about 1½” wide and predominantly gold with black markings. It is found along the West coast and is not known to frequent gardens but may do so in areas near its range.

It will nectar on two plants that can be added to a garden:
Agoseris grandiflora, Large-Flowered Agoseri
and
Heracleum maximum, Common Cow parsnip

If you reside on the periphery of its range in the coastal mountains, you might plant these Heracleum and Agoseris species. Both are available as either plants or seeds.

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CC, creative commons images are shown here.
The yellow flower is Agoseris and was taken at the Malibu Creek State Park. It is a PD, public domain image.
The white blossom is Heracleum maximum, and was taken in the Forillon National Park of Canada, Québec.